Why do hams often conclude messages with "73"?
Oct 25, 2013 · The usage of "73" for such a purpose comes from the Phillips Code, originally devised in the era of telegraphs to speed up transmission of common messages by mapping …
jargon - CB v Amateur Radio - Amateur Radio Stack Exchange
Aug 16, 2021 · I am learning about Amateur Radio so as I can go for my foundation licence but I was on CB back in the days, a channel nine monitor and used the 10 code and the Q code but …
digital modes - How do you log (or not) "busted" FT8 QSOs?
Oct 24, 2021 · Since it is "technically" a complete QSO I log it (in DXKeeper) but don't upload to e-qsl or LotW unless the other party does. If he does, I'll upload: if he doesn't I assume he has …
Antenna matching for a dipole - Amateur Radio Stack Exchange
Apr 5, 2025 · The question is whether the approach is OK or am I violating the design for dipole? The two elements of dipole are around 6cm away from each other. I am following 50ohm …
What's the difference between saying “CQ” or “QRZ” in a contest?
The best thing to do is to listen for a while, and notice which stations are being responded to. Sometime operators will prematurely respond with their callsign, without waiting to hear if the …
Balun and impedance matching suggestions for dipole antenna
May 3, 2016 · I would expect this antenna will be around 73 ohms of inductance (more or less because I expect some coupling to the carbon fiber structure of the aircraft). So my question …
How to measuring ferrite core efficiency vs frequency
Aug 1, 2019 · To help identify a mystery ferrite core mix, the most common method is to take some measurements to determine the initial permeability (µi). Then compare your results to a …
Dipole increased CM current using choke balun - Amateur Radio …
Aug 23, 2019 · I've read that an inverted vee lowers the 73 ohm dipole impedance closer to the 50-ohm coax impedance but connecting a coax unbalances the antenna, so I wanted also to …
Core mix preferences for a balun (or unun) vs a choke
May 10, 2022 · The MnZn ferrite cores (Mix 31, 73, 75) have high permeabilities above 800 µ, have fairly low volume resistivity and moderate saturation flux density. They offer high ‘Q’ …
Hottest 'jargon' Answers - Amateur Radio Stack Exchange
None of the above. There are no "73 codes" like 10-codes, 73 is just 73. Yes, I know about the 92 code, but it's well and truly dead, with no survivors other than 73 and occasionally 88, so ...